坎迪达阿尔比坎斯 (Candida albicans) 的细胞外囊泡通过cGAS和STING触发I型IFN信号
Hannah Brown Harding1,2, Geneva N Kwaku1, Christopher M Reardon1
1Division of Infectious Diseases, Department of Medicine, Massachusetts General Hospital, Boston, MA, USA.
Nature microbiology
|January 3, 2024
概括
IFN基因 (STING) 途径的循环GMP-AMP合成酶 (cGAS) 刺激器被细胞外囊中的Candida albicans DNA激活,从而增强宿主防御能力. 缺乏cGAS-STING成分的小鼠对这种真菌病原体的生存率有所改善.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 传染性疾病 传染性疾病
背景情况:
- I型干扰素 (IFN) 途径对于对抗真菌病原体Candida albicans的宿主防御至关重要.
- 在C. albicans感染期间激活这种途径的精确分子机制尚未完全理解.
研究的目的:
- 阐明宿主天生的免疫系统识别和响应Candida albicans的分子机制.
- 研究IFN基因 (STING) 通路的循环GMP-AMP合成酶 (cGAS) 刺激器在宿主防御C. albicans中的作用.
主要方法:
- 缺乏cGAS-STING通路组件的小鼠被静脉注射C. albicans的挑战.
- 通过测量干扰素刺激的基因,IFNβ产生和关键信号分子的酸化来评估cGAS-STING通路的激活.
- 在cGAS和STING中具有单核酸多态的人类单细胞被用来评估炎症性细胞因子的产生.
主要成果:
- 在C. albicans感染后,缺乏cGAS-STING的小鼠表现出更好的生存率.
- 含有生物膜相关的C. albicansDNA的细胞外囊被确定为cGAS-STING通路的触发器.
- 通过细胞外囊泡激活I型IFN是独立于Dectin-1/Card9和toll-like受体9.
- 在cGAS和STING的遗传变异显著影响了人类单细胞的炎症性细胞因子反应.
结论:
- 这种cGAS-STING通路在对Candida albicans的天生的免疫反应中起着至关重要的作用.
- 细胞外囊泡封装的真菌DNA是cGAS-STING通路的关键激活剂,导致I型IFN的产生.
- 这些发现为宿主病原体相互作用和C. albicans感染的潜在治疗点提供了新的见解.
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